Automatic flame hardening machine

Flame hardening machine is the use of combustible gases (such as acetylene, propane, etc.) and combustion-supporting gas (oxygen) to produce high temperatures generated by the flame to rapidly heat the surface of the saw blade to the austenitizing temperature, and use appropriate cooling methods to quickly cool down. The saw blade hardened by flame heating and surface hardening can obtain high hardness and wear resistance, thereby improving the mechanical properties of the saw blade. Due to the high heating rate of flame hardening, the austenite grains are not easy to grow and coarsen in a short time, so the hardening temperature is much higher than that of ordinary hardening. To obtain a shallow hardened layer, a faster hardening speed can be used, and the upper limit of the heating temperature is taken instead of the lower limit. The hardness and hardening depth of flame hardening depend on the gas mixture ratio and heating time. This equipment adopts automatic program to realize the function of automatic ignition and automatic start and stop according to the hardening progress.

Working principle

The saw blade can get a high hardness and wear resistance through the flame heating surface hardening, thereby improving the mechanical properties of the saw blade. The hardness and hardening depth of the flame quenching depends on the gas mixing ratio and the heating time.

Working process

The liquid oxygen and propane are converted into gas and conveyed to flame generator by means of a vaporizer. The flame generator is mounted on a movable rail and adjusts the position of the flame generator according to the thickness and diameter of the saw blade. After positioning, start the main shaft drive to rotate the saw blade, and then ignition, open the cooling water, adjust the flame by adjusting the inlet gas proportion of the flame generator, observe the saw tooth heating depth, open quenching cooling water after arriving requirements.

Specification

Application and features

For tooth tip heat treatment of saw blade diameters 1500-2000 mm,

Thickness: 8 -16 mm with flame hardening

Unique burner design warrants reliable warming of the tooth tip to the spot with excellent visibility to the conversion process

Quick machining of the saw blade given by high cycle and advance speeds

Reliably prevents surface hardening of the tooth gullets and ensures reproducibly high hardening results (substantially superior to the induction hardening process)

Application for US customer

Function

1. Saw blade specification preset- enter or select blade size, the machine flame generator traverse to the certain ignition point automatically.
2. Electric ignition function: electric pulse ignition.
3. The gas is equipped with dual pressure regulating valves to set the ignition pressure and working pressure respectively. PLC controls the switching of ignition pressure and working pressure.
4. Counting function, the screen displays the number of hardening teeth in real time. After completing the preset number of teeth, the hardening machine will automatically turn off the fire and the main machine will back to the initial position.
5. Manual fine-tuning function, observe the red hot state of the saw blade teeth, and fine-tune the distance between the burner and the saw blade teeth in working time to make sure the burning area is in the 1/3 of teeth tip.